package com.grf.hadoop.n_line_input_format;

import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Reducer;

import java.io.IOException;

public class NLineReducer extends Reducer<Text, IntWritable,Text,IntWritable> {

    private IntWritable v = new IntWritable();

    @Override
    protected void reduce(Text key, Iterable<IntWritable> values, Context context)
            throws IOException, InterruptedException {
        int sum = 0;
        for (IntWritable i:values) {
            sum += i.get();
        }
        v.set(sum);
        context.write(key,v);
    }
}
